Fisher Branch, MB F2 Tornado of June 21, 1984

Arborg - Hecla - Fisher River - Gypsumville

Figure 1 shows the surface observations at 7:00 am CDT, which shows a low pressure across northern Saskatchewan with a trough extending to a second low pressure on the Saskatchewan/North Dakota border. A cold front is seen extending south across western North Dakota from that low pressure as well. A warm front is observed across south-central South Dakota and central Nebraska.

Figure 1. Surface weather map for June 21 1984 at 7:00 am CDT (NOAA, 2020).

The warm front likely lifted north throughout the morning hours of June 21st. The interaction between the trough of low pressure, the cold front and warm front likely put southern Manitoba in a “triple-point” scenario. This triple-point became a favourable environment for rotating supercells in the afternoon hours of June 21st, which ultimately led to three tornadoes across Manitoba on this day.

Figure 2. 500mb weather map for June 21, 1984 at 7:00 am CDT (NOAA, 2020).

According to Environment and Climate Change Canada (2018), an F2 tornado touched down at 7:00 pm CDT south of Fisher Branch, MB. The track and width of this tornado was not documented by ECCC. The tornado caused no injuries, fatalities or property damage.


NOAA Central Library. (2020). U.S. Daily Weather Maps. Thursday June 21, 1984 [PDF]. Retrieved from

Environment and Climate Change Canada Data. (2018). Canadian National Tornado Database: Verified Events (1980-2009) – Public. Retrieved from: